1)A medical syndrome in which
the penis has worn out with the passing of time.
The skin of
the penis may
sometimes become floppy, wrinkly, and will often appear dry.
2)A penis that can no longer attain an erection, due to old age or over use.
Word origin: decrepit and penis
"
Professional slut: I fucked an old guy
yesterday for a business promotion; he had a real nasty decrepenis."
"Doctor: I'm afraid you have been
diagnosed with Decrepenis syndrome"